The Siemens SIRIUS 3RH2131-1BB40-ZX95 is a size S00 auxiliary contactor with a 24 VDC coil and three normally open instantaneous contacts. The 24 VDC coil draws 4 W closing and 4 W holding, so the control transformer or PLC output driving it should be sized for that inrush without sag.
The three NO contacts are rated for switching at multiple voltage levels: 10 A at 24 V, 10 A at 230 V, 3 A at 400 V, 1 A at 690 V, and 0.5 A at 440 V. These ratings cover AC loads across common industrial voltages — the 10 A at 230 V is typical for general-purpose control circuits, while the 3 A at 400 V suits three-phase motor control circuits. The contacts also carry DC ratings: 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.26 A at 600 V. The arcing time is 10 to 15 ms, and the maximum mechanical switching frequency is 10,000 cycles per hour at AC.
Mounting and environmental
Mounting position is flexible: the contactor can be rotated ±180° on a vertical surface and tilted forward or backward by ±22.5°. Clearances required: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Pollution degree 3 (industrial environment with conductive pollution). Relative humidity minimum 10 %. The contactor accepts wire cross-sections from 2x 0.5 mm² up to 2x 4 mm² solid or stranded.